Add return type in some Class

[aegladkikh]

Hello, i use php 8.3? and i see this in my log, can you fix this noticed?

Log:
1x: Method "ArrayAccess::offsetGet()" might add "mixed" as a native return type declaration in the future. Do the same in implementation "Elastic\Elasticsearch\Response\Elasticsearch" now to avoid errors or add an explicit @return annotation to suppress this message.